Cementing machine



Nov. 30, 1937. c ROBERTS 2,100,452

CEMENTING MACHINE Filed Ju1 27, 1936 WEN 87% Uta Patented Nov. 30, 1937 UNITED STATES PATENT OFFICE CEMENTING MACHINE Clifford Roberts, Winchester, Mass, assignor to United Shoe Machinery Corporation, Paterson, N. J., a corporation of New Jersey Application July 2'7, 1936, Serial No. 92,791

5 Claims tached to the upper chiefly or wholly by means of an adhesive, hereinafter referred to as ce-' ment, it is the usual practice to apply a mar-- g'inal band of cement to the shoe sole and another band or cement to the overlasted upper along the margin of the-bottom of the shoe.

When cements of the pyroxylin type are employed, it is customary to allow these coatings to dry' and then to activate them by' the application of a solvent.' After this, the shoe and the sole are brought together and sole-attaching pressure is applied. With other types of cement in which rubber or a rubber substitute is a constituent, the use of an activator is not usual as the sole and the shoe are brought together after a drying period and while the'coatings are still adhesive.

In connection with some cements which are of the selfvulcanizing type, an accelerator is' incorporated and is mixed with the cement prior toits application to the work to cause the vulcanization to take place at room temperature. With a cement of this type, it is not possible to mix quantities larger than'those which are to be employed in a few hours because of the danger that the vulcanization process will ad- Vance too far before the coating material is applied. I

An object of this invention is to provide an improved machine facilitating the mixture of component parts of a compound coating material directly in the machine by means of which the compound is to be applied to the work.

In the illustrated machine, in accordance with features of the invention, separate reservoirs are provided, one for the cement and the other for the accelerator, with valves to control the delivery from said reservoirs directly into a mixing chamber provided with an agitator so that the components may be thoroughly intermingled prior to their application to the work. In view of the fact that only small quantities of the accelerator are needed for mixture with comparatively large quantities of the cement, the reservoirs may conveniently be provided with measuring devices, such as graduated sight glasses, to enable the operator to let out the desired amounts from each reservoir into the mixing chamber.

These and other features of the invention will be better understood from consideration of the following description taken in connection with the accompanying drawing, in which Fig. 1 is an elevation of the head of a cementapplying machine involving my invention, and

Fig. 2 is a detail view in elevation taken from theright side of Fig. 1.

Although my invention maybe employed with various types of cement-applying machines, it has been hereinillustratedas utilized in connection with a machine of the extrusion type having a cement-applying nozzle Hi to which the margin of 'a shoe sole may be presented by coacting f eed rolls i2 and I l, the sole being guided by a gaging device it; Thelower, feed roll it is mounted on a pivoted arm. l8 having an extensionZli through'which passes a control rod 22 joined to a lever 24. The fiow of cement through'the nozzle is controlled by'a valve 26 and the valve is connected by means of a rod 28 and a lever 30 to this same control rod 22.

Thus, whenever the levers 24 and 30 are turned.

under the actuation of atreadle rod 32, cement will flow through the nozzle and the feedrolls will be turned to present; successive portions of the margin of the sole for the application of cement. Power is supplied to the machine through apulley t d'mounted on a drive shaft 35 and when the treadle rod is depressed, a clutch 38 is closed and power is supplied not only to the feed rolls but also to a gear pump lfl directly connected to an outlet 42 in a sump 44 forming part of a mixing chamber. 46. From this gear pump 46, the cement is delivered under pressure through a pipe 43 to thenozzle i0. '35

have upright operating rods 62 normally held down by springs 64 but capable of being lifted V by hand levers 6G or 68 secured to cross rods 10 and 12 pivotally mounted in ears provided on a top 14 for said reservoirs. To permit the reservoirs to be conveniently filled, a hinged cover [6 (Fig; 2) common to the two is provided. When this cover has been closed, it is held in closed position by a clamp bolt 18. It will be observed that the cross rods 10 and I2 are provided with toe pieces 8!) which underlie collars 82 secured to the upper ends of the associated valve rods 62. If desired, these reservoirs may be provided with sight glasses 84 having graduated scales 8% so that when the operator lifts the desired valve 60, he may, by inspection of the level of the fluid with respect to a scale 85, determine just how large a quantity is being let into the mixing chamber 48. In view of the fact that only a. very small quantity of the accelerator is required for treatment of a charge of cement, the separate reservoirs 48 and 58 may, if desired, have cross sections having a ratio similar to the ratio of the two quantities. If this is the case, it will only be necessary for the operator to allow the level of the accelerator to fall as many graduations on its scale as the level of the cement has fallen.

Uniformity of the action of the accelerator on the cement depends in a large degree on the thoroughness with which these two components are mixed. Accordingly, agitator blades 90 and 92 are provided in the sump 44 of the mixing chamber. These blades are conveniently mounted on an upright shaft 94 which is journaled in a bearing 96 formed on the top M of the reservoirs and provided with a pulley 93 driven by a belt It!) passing over idlers I02 and a pulley I 04. This latter pulley is secured to the drive shaft 36.

In the use of the machine, supposing that the reservoirs 48 and 56 have been supplied with the component materials, the operator will press first one and then another of the valve levers 66 and 68 and allow the desired quantities of the component materials to flow through. the outlets of the reservoirs into the mixing chamber 46. Power having been supplied to the driving pulley 34, this material will be thoroughly mixed by the agitator blades 98 and 92 and be ready to be withdrawn through the outlet 42 by the pump 40 and de- "livered to the nozzle I0 whenever the operator depresses the treadle rod 32. This same action of depressing the treadle rod is also effective to raise the lower feed roll I 4 thereby to grip the sole and cause successive portions of its margin to be presented to the nozzle l0 and coated with the compound coating material.

Having described my invention, what I claim as new anddesire to secure by Letters Patent of the United States is:

1. In a machine for coating the margin of a shoe part, a unitary structure comprising a frame supporting a cement-applying device as well as means for feeding the shoe part past the applying device to present successive portions of the margin thereto, and means also supported on the frame for supplying cement to said applying device, said cement-supplying means comprising a plurality of storage reservoirs, a mixing chamber into which the storage reservoirs deliver, an agitator, in the chamber, valves for controlling the flow between the storage reservoirs and the mixing chamber and means for delivering mixed cement from the mixing chamber to the applying device.

2. In a machine for applying a band of cement to the margin of a shoe sole, a frame an extruding nozzle thereon, means supported on the frame adjacent to the nozzle for feeding the sole past the nozzle to present successive portions of the margin thereto, a mixing chamber on the frame, reservoirs for components of the cement, said reservoirs being carried by said mixing chamber and communicating with said reservoirs, means facilitating the withdrawal of measured portions of components from the reservoirs to the mixing chamber, an agitator in said mixing chamber, and means interposed between the mixing chamber and the nozzle for supplying cement under pressure to the nozzle.

3. In a machine for coating a shoe part, an applying device, a mixing chamber connected to said applying device to supply coating material thereto, a removable cover for said mixing chamber supporting supply reservoirs formed integrally with said cover, a cover for said reservoirs, and an agitator for said mixing chamber having a shaft journaled in the covers of said mixing chamber and reservoirs respectively.

4. In a machine for coating shoe parts, an applying device, a chamber connected to said applying device to supply coating material thereto, reservoirs adapted to contain components of said coating material, said reservoirs being provided with outlet openings leading to said chamber, valves controlling saidopenings, the cover for said reservoirs comprising a fixed covering portion and a movable covering portion, and actuating devices for said valves mounted on the fixed portion of said cover.

5. In a machine for coating shoe parts, an applying device, a mixing chamber connected to said applying device to supply coating material thereto, an agitator in said mixing chamber, means outside the chamber for driving the agitator, supply reservoirs mounted on the machine and arranged to deliver into said mixing chamber, covers for said reservoirs, and means on said covers and extending through the reservoirs, for controlling the flow between the reservoirs and the mixing chamber. I

CLIFFORD ROBERTS. 

